From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C447C433B4 for ; Sun, 9 May 2021 14:37:28 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6C03A610CD for ; Sun, 9 May 2021 14:37:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6C03A610CD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44966 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lfkYg-0003Kb-D9 for qemu-devel@archiver.kernel.org; Sun, 09 May 2021 10:37:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37274) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfkWs-0001FF-3b for qemu-devel@nongnu.org; Sun, 09 May 2021 10:35:34 -0400 Received: from indium.canonical.com ([91.189.90.7]:53124) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lfkWo-0007SR-V8 for qemu-devel@nongnu.org; Sun, 09 May 2021 10:35:33 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lfkWn-0005Od-DR for ; Sun, 09 May 2021 14:35:29 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 5D0662E800F for ; Sun, 9 May 2021 14:35:29 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 09 May 2021 14:26:22 -0000 From: Thomas Huth <1902365@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Incomplete; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: germano.massullo th-huth X-Launchpad-Bug-Reporter: Germano Massullo (germano.massullo) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <160415134441.32721.13907448081294609819.malonedeb@chaenomeles.canonical.com> Message-Id: <162057038385.10558.3071480062807147335.malone@chaenomeles.canonical.com> Subject: [Bug 1902365] Re: 3x 100% host CPU core usage while virtual machine is in idle X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="dccd804998035922efb3da0a725ecc923e2255f3"; Instance="production" X-Launchpad-Hash: 4937397caa32ecad5382729d66240fedf5ccc670 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -66 X-Spam_score: -6.7 X-Spam_bar: ------ X-Spam_report: (-6.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1902365 <1902365@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The QEMU project is currently moving its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting the bug state to "Incomplete" now. If the bug has already been fixed in the latest upstream version of QEMU, then please close this ticket as "Fix released". If it is not fixed yet and you think that this bug report here is still valid, then you have two options: 1) If you already have an account on gitlab.com, please open a new ticket for this problem in our new tracker here: https://gitlab.com/qemu-project/qemu/-/issues and then close this ticket here on Launchpad (or let it expire auto- matically after 60 days). Please mention the URL of this bug ticket on Launchpad in the new ticket on GitLab. 2) If you don't have an account on gitlab.com and don't intend to get one, but still would like to keep this ticket opened, then please switch the state back to "New" or "Confirmed" within the next 60 days (other- wise it will get closed as "Expired"). We will then eventually migrate the ticket automatically to the new system (but you won't be the reporter of the bug in the new system and thus you won't get notified on changes anymore). Thank you and sorry for the inconvenience. ** Changed in: qemu Status: New =3D> Incomplete -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1902365 Title: 3x 100% host CPU core usage while virtual machine is in idle Status in QEMU: Incomplete Bug description: My Fedora 33 machine "top" command shows qemu-system-x86_64 process using ~300% CPU, that means 3x CPU cores at 100%. Since the virtual machine (named CentOS 8) is almost in idle (top command inside the VM shows ~0% CPU usage), there must be something wrong. I attach qemu process GDB backtrace, and virtual machine libvirt XML Host details: libvirt-6.6.0-2.fc33.x86_64 qemu-system-x86-5.1.0-5.fc33.x86_64 virt-manager-3.1.0-1.fc33.noarch kernel 5.8.16-300.fc33.x86_64 CPU: AMD Ryzen 5 3600 # gdb qemu-system-x86_64 405756 GNU gdb (GDB) Fedora 9.2-7.fc33 Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from qemu-system-x86_64... Reading symbols from .gnu_debugdata for /usr/bin/qemu-system-x86_64... (No debugging symbols found in .gnu_debugdata for /usr/bin/qemu-system-x8= 6_64) Attaching to program: /usr/bin/qemu-system-x86_64, process 405756 [New LWP 405788] [New LWP 405798] [New LWP 405799] [New LWP 405800] [New LWP 405801] [New LWP 405802] [New LWP 405804] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". 0x00007f549d0bdb0e in ppoll () from target:/lib64/libc.so.6 (gdb) set height 0 (gdb) set print elements 0 (gdb) set print frame-arguments all (gdb) thread apply all backtrace Thread 8 (Thread 0x7f53837ff640 (LWP 405804)): #0 0x00007f549d0bda0f in poll () from target:/lib64/libc.so.6 #1 0x00007f549e4c2d1e in g_main_context_iterate.constprop () from target= :/lib64/libglib-2.0.so.0 #2 0x00007f549e4716ab in g_main_loop_run () from target:/lib64/libglib-2= .0.so.0 #3 0x00007f549dcfcc66 in red_worker_main.lto_priv () from target:/lib64/= libspice-server.so.1 #4 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #5 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 7 (Thread 0x7f5390dfd640 (LWP 405802)): #0 0x00007f549d0bf58b in ioctl () from target:/lib64/libc.so.6 #1 0x000055a60728ec87 in kvm_vcpu_ioctl () #2 0x000055a60728edc1 in kvm_cpu_exec () #3 0x000055a60734dc04 in qemu_kvm_cpu_thread_fn () #4 0x000055a6076dc0ff in qemu_thread_start () #5 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #6 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 6 (Thread 0x7f53915fe640 (LWP 405801)): #0 0x00007f549d0bf58b in ioctl () from target:/lib64/libc.so.6 #1 0x000055a60728ec87 in kvm_vcpu_ioctl () #2 0x000055a60728edc1 in kvm_cpu_exec () #3 0x000055a60734dc04 in qemu_kvm_cpu_thread_fn () #4 0x000055a6076dc0ff in qemu_thread_start () #5 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #6 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 5 (Thread 0x7f5391dff640 (LWP 405800)): #0 0x00007f549d0bf58b in ioctl () from target:/lib64/libc.so.6 #1 0x000055a60728ec87 in kvm_vcpu_ioctl () #2 0x000055a60728edc1 in kvm_cpu_exec () #3 0x000055a60734dc04 in qemu_kvm_cpu_thread_fn () #4 0x000055a6076dc0ff in qemu_thread_start () #5 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #6 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 4 (Thread 0x7f54988b7640 (LWP 405799)): #0 0x00007f549d0bf58b in ioctl () from target:/lib64/libc.so.6 #1 0x000055a60728ec87 in kvm_vcpu_ioctl () #2 0x000055a60728edc1 in kvm_cpu_exec () #3 0x000055a60734dc04 in qemu_kvm_cpu_thread_fn () #4 0x000055a6076dc0ff in qemu_thread_start () #5 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #6 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 3 (Thread 0x7f549917b640 (LWP 405798)): #0 0x00007f549d0bda0f in poll () from target:/lib64/libc.so.6 #1 0x00007f549e4c2d1e in g_main_context_iterate.constprop () from target= :/lib64/libglib-2.0.so.0 #2 0x00007f549e4716ab in g_main_loop_run () from target:/lib64/libglib-2= .0.so.0 #3 0x000055a6073c4c81 in iothread_run () #4 0x000055a6076dc0ff in qemu_thread_start () #5 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #6 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 2 (Thread 0x7f549b93a640 (LWP 405788)): #0 0x00007f549d0c350d in syscall () from target:/lib64/libc.so.6 #1 0x000055a6076dce9a in qemu_event_wait () #2 0x000055a6076e56ca in call_rcu_thread () #3 0x000055a6076dc0ff in qemu_thread_start () #4 0x00007f549d19c3f9 in start_thread () from target:/lib64/libpthread.s= o.0 #5 0x00007f549d0c8b03 in clone () from target:/lib64/libc.so.6 Thread 1 (Thread 0x7f549bb10f00 (LWP 405756)): #0 0x00007f549d0bdb0e in ppoll () from target:/lib64/libc.so.6 #1 0x000055a6076f4901 in qemu_poll_ns () #2 0x000055a6076f0485 in main_loop_wait () #3 0x000055a60735cdd7 in qemu_main_loop () #4 0x000055a607234a1e in main () (gdb) = = # virsh dumpxml centos8 centos8 4096000 4096000 4 /machine hvm EPYC-IBPB AMD destroy restart destroy /usr/bin/qemu-system-x86_64